[AArch64][SME] Fix inlining bug introduced in llvm#78703

The issue didn't surface because the tests were not testing what
they were supposed to test.

llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp

@@ -233,15 +233,20 @@ static bool hasPossibleIncompatibleOps(const Function *F) {
 
 bool AArch64TTIImpl::areInlineCompatible(const Function *Caller,
                                          const Function *Callee) const {
-  SMEAttrs CallerAttrs(*Caller);
-  SMEAttrs CalleeAttrs(*Callee);
+  SMEAttrs CallerAttrs(*Caller), CalleeAttrs(*Callee);
+
+  // When inlining, we should consider the body of the function, not the
+  // interface.
+  if (CalleeAttrs.hasStreamingBody()) {
+    CalleeAttrs.set(SMEAttrs::SM_Compatible, false);
+    CalleeAttrs.set(SMEAttrs::SM_Enabled, true);
+  }
+
   if (CalleeAttrs.hasNewZABody())
     return false;
 
   if (CallerAttrs.requiresLazySave(CalleeAttrs) ||
-      (CallerAttrs.requiresSMChange(CalleeAttrs) &&
-       (!CallerAttrs.hasStreamingInterfaceOrBody() ||
-        !CalleeAttrs.hasStreamingBody()))) {
+      CallerAttrs.requiresSMChange(CalleeAttrs)) {
     if (hasPossibleIncompatibleOps(Callee))
       return false;
   }
@@ -4062,4 +4067,4 @@ bool AArch64TTIImpl::shouldTreatInstructionLikeSelect(const Instruction *I) {
       cast<BranchInst>(I->getNextNode())->isUnconditional())
     return true;
   return BaseT::shouldTreatInstructionLikeSelect(I);
-}
+}

llvm/test/Transforms/Inline/AArch64/sme-pstatesm-attrs.ll

@@ -137,12 +137,12 @@ entry:
 ; [ ] N  -> SC
 ; [x] N  -> N + B
 ; [ ] N  -> SC + B
-define i32 @normal_caller_locally_streaming_callee_inline() {     ; FIXME: This is a bug, it shouldn't inline!
-; CHECK-LABEL: define i32 @normal_caller_locally_streaming_callee_inline
+define i32 @normal_caller_locally_streaming_callee_dont_inline() {
+; CHECK-LABEL: define i32 @normal_caller_locally_streaming_callee_dont_inline
 ; CHECK-SAME: () #[[ATTR1]] {
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[RES_I:%.*]] = call i32 @llvm.vscale.i32()
-; CHECK-NEXT:    ret i32 [[RES_I]]
+; CHECK-NEXT:    [[RES:%.*]] = call i32 @locally_streaming_callee()
+; CHECK-NEXT:    ret i32 [[RES]]
 ;
 entry:
   %res = call i32 @locally_streaming_callee()
@@ -154,12 +154,12 @@ entry:
 ; [ ] N  -> SC
 ; [ ] N  -> N + B
 ; [x] N  -> SC + B
-define i32 @normal_caller_streaming_compatible_locally_streaming_callee_inline() {  ; FIXME: This is a bug, it shouldn't inline
-; CHECK-LABEL: define i32 @normal_caller_streaming_compatible_locally_streaming_callee_inline
+define i32 @normal_caller_streaming_compatible_locally_streaming_callee_dont_inline() {
+; CHECK-LABEL: define i32 @normal_caller_streaming_compatible_locally_streaming_callee_dont_inline
 ; CHECK-SAME: () #[[ATTR1]] {
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[RES_I:%.*]] = call i32 @llvm.vscale.i32()
-; CHECK-NEXT:    ret i32 [[RES_I]]
+; CHECK-NEXT:    [[RES:%.*]] = call i32 @streaming_compatible_locally_streaming_callee()
+; CHECK-NEXT:    ret i32 [[RES]]
 ;
 entry:
   %res = call i32 @streaming_compatible_locally_streaming_callee()
@@ -409,12 +409,12 @@ entry:
 ; [ ] SC -> SC
 ; [ ] SC -> N + B
 ; [x] SC -> SC + B
-define i32 @streaming_compatible_caller_streaming_compatible_locally_streaming_callee_inline() "aarch64_pstate_sm_compatible" { ; FIXME: This is a bug!
-; CHECK-LABEL: define i32 @streaming_compatible_caller_streaming_compatible_locally_streaming_callee_inline
+define i32 @streaming_compatible_caller_streaming_compatible_locally_streaming_callee_dont_inline() "aarch64_pstate_sm_compatible" {
+; CHECK-LABEL: define i32 @streaming_compatible_caller_streaming_compatible_locally_streaming_callee_dont_inline
 ; CHECK-SAME: () #[[ATTR0]] {
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[RES_I:%.*]] = call i32 @llvm.vscale.i32()
-; CHECK-NEXT:    ret i32 [[RES_I]]
+; CHECK-NEXT:    [[RES:%.*]] = call i32 @streaming_compatible_locally_streaming_callee()
+; CHECK-NEXT:    ret i32 [[RES]]
 ;
 entry:
   %res = call i32 @streaming_compatible_locally_streaming_callee()